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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c39c853e646dbfaaa4b9a3834828338361fe0056f70a3f88854f2c086a84f06' 
  AND token = 'D/Igkm9Ob2N0I+VrGoguaeF0ZcuazH7vZ6pSZ/JEbIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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