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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd234df89994f051ecf541b10c13e4d60ceb5ac9cf6e12a65f4d3bfe19ed014b8' 
  AND token = 'TyF7qW9qFgULD1m6ZaVYk4dSaAuI0Bb/B2M5Hs5yb4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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