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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aba8d1ebf959c9c25a8cd61eddb262fffb958f760a02d8b7b524b43e7114ad3' 
  AND token = 'i0dS4f3Rf1mkPkIChgdQtLp0M6sJI7eQot9eN/VzQZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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