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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f850947d7a195823288f8c997427fbddd3d7e4c9408ad3d9e8eb5cf9f105cfe' 
  AND token = 'Tdfa0M5temqtEIE73pL36Dz5V8V3l0zTqyEkuXw+T1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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