SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33130e81e4e48281cdf262ea398247fa1d6df25fd0f81c17757854f85ff8489b' 
  AND token = 'gIjJVKQDRUGLU62NFiCviPMwzDFYBRBhp0xb7hZOfPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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