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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1cfeb8cc9e049b1ae2fa3dcec90feb8abb758401db594ff2467944fee59497' 
  AND token = 'fp9FyPkqvEvCxMaAyG8u1UQLHoUiIrG1VrMbHKN2c84=' 
  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"
    }
  }
}