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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225969146510c948f3ab61b5a8be3b5ad0a9896338bef250654a9cafdd01ac21' 
  AND token = 'DISFiNE/jIx4S1VbguVvd65guY/nchxeYCPuraEsjuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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