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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438e6506b9b4bf4c82572da0feb440df0e3683df045a2741015f3e344e9a53e5' 
  AND token = 'Bamu/cIazIijidW6eowGIcWl5zY03vbG951Q0Cp+hM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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