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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e135b31ae0f79787c1a2c323cb9eb57ff65bf26dfef611d0d3e08e8607d840' 
  AND token = '1GGpd+gHXOFOzuvWNTqD5Xvdi5h+xGbXGvWMEbmYAUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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