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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5cce5814ee79d4e0f0db53c18a143dff80c373f22535ce93052950d6c592e1' 
  AND token = 'UxlsUmnaWh6ml//swgsA8HcXjyEjckV9TBx4SC8SACs=' 
  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"
    }
  }
}