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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cc9ae4ff9b2fb9040ff3f50019f47fa59107c358fb3f71520c9bf8ac21c11b' 
  AND token = '2ktgtMRyKvc9rBwkTtKsnRUQMpWRyfV30P3NQYBJHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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