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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d424719f1d3a18d3a6d31d9e6ba4fd4ad3e1bf1d482c2f165e221056d3814f6' 
  AND token = 'Fl94GL3BYg0IjcDlWEv5IW/uSahjPGDWrhT6v3n8VIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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