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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6860fd57c0c3b24ee75e94595f643ba3bc1d5005fa93c0131b34e457d566102a' 
  AND token = 'SzU35K8FR7SGriEK4WK+UI2JnemnJ8pndBbtfbSRWVE=' 
  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"
    }
  }
}