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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b652ca97e92c63737c83f48f438f7b019fe671f34c346b6355e311088782011' 
  AND token = 'QHVbVcvGvlS4gTYaY4w/0WIkMi5+vIq2g6WfFkoVDYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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