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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ce3568352359ddad5c54c5be16a1dbc3f2c028a247abfd5af9b7ca1c2372d1' 
  AND token = 'A1FYh7UpuG9ASSDF65xyqr+c6BTCuFFu6j/hhU56bUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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