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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38569e54f744106f88fbe64751e286849d12834e53c7c66c8a20bc9c78bb1c7f' 
  AND token = 'IB+E4dyQyJEA9Six4mw9+3Mocqx3h80PQ4BR7ZnVoYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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