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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e00fb03ccc67c6d86e8708fdacc95b3ef77262e52bd8e2da5cad42541d5cad' 
  AND token = '1JCA39ylBPjAO6JimYtb1YVi9Vu1eGiil/5CvJrEK1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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