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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3e74bf6b0f12fc5a3a600d2f4c0c27a57fbffe8266c9d5b178c7c8f4594e1b' 
  AND token = 'qZwv12dGrXGfWr5t9m6cX9Rsa/4fB3ul6naqHWHojjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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