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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8adaba7e032313905b4d38db8ce3fb66d6afa8c1ac5763f18710de21e68a5c' 
  AND token = 'sEVr26qmmLPNEk8lGghA1qHy1A1QwmT6Shbawnr7FKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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