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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f0771ed6427b6d0f4fc0806c8e93051090c0a0cb0c1a7b41d8ea76f21238ff' 
  AND token = 'twoxIoAjO9OvEwz5HC/LQhO1f/LHFjgPjmVjRRhc0tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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