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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4603d8f8418faf2a3146945fd8bd1a3fd60176db4b69331ddec5868a43f00c2e' 
  AND token = 'OMVzmTQFpgFr5hD5dMigwrNwN4Dq1/Y2m8cpM/h1efs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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