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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4198d245db34b2e78fe1caa0c0ce961335b416526fedb62a8299b1fb2e59c37f' 
  AND token = 'aEzW10K0mUVz9nlm8LSFv+Q7PEm8FrQLZJyrhooWPlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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