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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5326d946bd2079dd2ff85e969d883b048ce3f9de9f508ec1f14a62280c616e' 
  AND token = 'B6c5GTUMe1D84vYARGJYQqhj4T937pkBeCD8tZNB/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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