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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f90619c455b06c748481e8eda11b140bb9641cc64d9a6428c0f0d69d70897b' 
  AND token = '+2PlqLHaNWKfhprZU7X6KO+whHuvv+XJKxq4TKHeXTk=' 
  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"
    }
  }
}