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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0271d7805f0485eed88cc7679d18e78a26462ca279bc0a52ad2ce6acefe9612' 
  AND token = 'OcuJ0lc+nzr4pqUeJ6SWn9+pMtmWWbdtr05FMTIgpCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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