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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baff017dd5272ee8934580aea0023aa29a2d8024a718589801a422ff0cc7ce72' 
  AND token = 'XPHA6JVmR8fV4kPagBWFmr0eN+cI0LW5zpeejm2tmGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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