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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79e805ae9060d7d0ad89d7600e30de4e7051997eee3bc3011cf09c6162a114e' 
  AND token = 'hsK/pEQP53NVltRF7f5msj8sN346uDjw6zAYjsUSGlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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