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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df32e631111967d4836eb6af957690b449c637203075e2891588e2fea859c5be' 
  AND token = 'XR87FQ0qaz3WSRu2s0xz72MiWX9ZaDBJkE4y1m7NLnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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