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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b485bd40627008cbb34a6b74e9b60a45355bb655c5212a2cb93db72e551ddc' 
  AND token = '1ejjheQd1Gs4gO1h+3BO7Ynil2O3kpLNe1ihYVRkems=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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