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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da2a58e3c0acce85e907c44d938c13febbe6b86a16da6b3893d74fefce0b43a' 
  AND token = '8pljkIzn/pV4sCibfbl9kP3UAM1oUGPLOTbwpVeTD0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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