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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b61e4d7f8af695ddef8c1bfcbc5866cf2134be782780c21d655e3b1165e237' 
  AND token = 'mwlsmbECWUNxFSiWdYdDaWAPY+ThRtQZxvXdT7v2uyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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