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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140d0102a3faa2aab686fc38592b0be3c84e3bc38694e83bb83b01dd95632aa2' 
  AND token = 'wlnIrSyy9VvY/XdYwPJxMpjJDwPO8jWNPyWnuhAR2PE=' 
  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"
    }
  }
}