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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f8b569b3d534313d78d9bb17ce64774cb4c38041b1bd126c7d8b28c4bab168' 
  AND token = 'dvOrJnkBL+CLNem2hXUCtkIXtUr6SbRVE6T6M7/n2nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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