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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71338ac573fe22d83b141dd3ceafbde812b652bb88b03e7f747b67e26581a9ed' 
  AND token = 'ar3M6pUvdvJ1nY27ZaZb+ZAg+d3av2FSbDEWSvHISD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}