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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71937bd4acf8e286eae234a0d4160ba8ce896251f0f83ec7053bd7aa153f6bd9' 
  AND token = 'bOxbchEsfMiZ/Sa8Jnd6fXtPIvagFf2pggw/t1O1wiA=' 
  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"
    }
  }
}