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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc424ee6ea27380a7e07828620e4a766eb1013b36d8a327f3d7730f12e3a873' 
  AND token = 'uvk/MX0YOb8iRf2bnognMwdo03w3mlBni2y30P9lFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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