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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb291b8b4f175c8e8004c9690a01733e8a7dec327687872df45e062807b30d7c' 
  AND token = 'iPzm/DjNNnFv8jaQVLctD+2LaF2hg1HVki/66RxClkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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