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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd511a1b913a1ec93c6eec3b06ceedb67a9c11cfb53a0ea54734e80def71bdc' 
  AND token = 'CVN6Ci7XPWKUb8d9Ac4W9YzOzyY/yfGNCjTvej2z934=' 
  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"
    }
  }
}