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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36b6358e5c2a9d1a191d46828cfb8ade5a7dbda33b0dfd21eb8b5a0783d1d29' 
  AND token = 'DcLOje2Yu8J26dZyS1DRpGNadx7xpnk6nfCAjHoHII4=' 
  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"
    }
  }
}