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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449db360b82886b9165f8d7ec51f8f5c8a43ee15d62352d0517ae19e395578c7' 
  AND token = '2e066VqCM77eofaeCyOF66rHvFMINbAjrBb/KsFDzws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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