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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3560e784082c28c765ec9c241bf8040500905f89cd2c9b94310b14b07270d6e8' 
  AND token = 'FBXXUXadfAE7kUq95I9uhSsW751NJ2eulGkbrk3FEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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