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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0e859e4e23b951665af23c09440889e656219b8070e3a245d4c2efe68e849a' 
  AND token = '9GC5n5m4DHH0XxtrXP1x7T3OaEq605ayJioMho/i3WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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