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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d9c4166d94cfae75d15b07cd713aa20ca5b18047359b371583ca09f088519c' 
  AND token = '4TAV7eaVLDEplji3wkJMGFFqzFc7BG4wIUqjtNDxihQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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