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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ea582556ee209f65147d1ec00c9ea2d7d544c1d44cf24f75b98e4056326f13' 
  AND token = 'w3lB6yNVsY2MbqSW6c9HugX3mZOPcAq5LCYF4kXb4/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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