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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b22da2125a69177b95f15e6411ccc3fef5e41aea129ea9bf6003ba91fa9f7d' 
  AND token = 'xcokQgEvWmZFfpsAe2gKBuM/lpqcFmPwG6nRBMn96zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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